tools: fix Raspbian armv7 build

PR-URL: #31041
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

tools/v8_gypfiles/v8.gyp

@@ -809,7 +809,7 @@
         }],
         # Platforms that don't have Compare-And-Swap (CAS) support need to link atomic library
         # to implement atomic memory access
-        ['v8_current_cpu in ["mips", "mipsel", "mips64", "mips64el", "ppc"]', {
+        ['v8_current_cpu in ["mips", "mipsel", "mips64", "mips64el", "ppc", "arm"]', {
           'link_settings': {
             'libraries': ['-latomic', ],
           },